M&G DuraVent is the first manufacturer to have a UL-listed relining system for factory-built chimneys. Our PelletVent Pro relining system can be used for wood, pellet, and biofuel burning appliances. When an insert is installed into an existing factory built chimney or b vent, relining the existing chimney is critical for proper performance and safety.

What Does the UL listing cover?

All 127, 103, 103HT chimneys or b vent Insulated chimneys- all sizes with 2” clearance Air cooled - clearance based on diameter All Pellet approved M&G DuraVent systems Flex does not need insulation!!!